Contraception

I started taking pills last month and that was my first time, also im 20 yr old and i take the pills after my menstruation and ayin na nga i started taking pills hindi ko tinapos actully 5 pcs(5days) lang nainom ko and the problem is after I stopped taking pills and nag ka mens ulit ako after i stopped so after a month a had a unprotected sex and my mens was 31 cycle and now its my 29th cycle. It’s normal po ba or nah? Thanks dor response